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Place the following elements in order of decreasing atomic radius:

A. Cd > Sr > Sb
B. Sb > Sr > Cd
C. Sr > Cd > Sb
D. Sb > Cd > Sr
E. Sr > Sb > Cd

Answer :

To determine the order of the elements in decreasing atomic radius, let's look at the atomic radii of each element:

1. Strontium (Sr) has an atomic radius of 215 pm.
2. Cadmium (Cd) has an atomic radius of 161 pm.
3. Antimony (Sb) has an atomic radius of 140 pm.

To arrange the elements in decreasing order of atomic radius, we start with the largest atomic radius and proceed to the smallest.

By comparing the atomic radii:
- Strontium (215 pm) is the largest,
- followed by Cadmium (161 pm),
- and Antimony (140 pm) is the smallest.

So, the order of elements from largest atomic radius to smallest is:

Sr > Cd > Sb

Therefore, the correct choice is:

[tex]$Sr > Cd > Sb$[/tex]

This matches with option number 3 from the given list.

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